The driver will
try to auto-detect the amount of video memory present for
all chips. If it’s not detected correctly, the actual
amount of video memory should be specified with a
VideoRam entry in the config file
"Device" section.

Additionally,
you may need to specify the bus ID of your card with a
BusID entry in the config file
"Device" section, especially with FBDev
support.

The following
driver Options are supported:
Option "UseFlatPanel"
"boolean"